264  
FNUS74 KHUN 201159  
FWSHUN  
 
SPOT FORECAST FOR HOG HOUSE RX...USFS  
NATIONAL WEATHER SERVICE HUNTSVILLE AL  
659 AM CDT FRI APR 20 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 CDT ON APRIL 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
A RIDGE OF SURFACE HIGH PRESSURE WILL PUSH EASTWARD ACROSS THE  
GREAT LAKES REGION TODAY, MAINTAINING A LOW-LEVEL NORTHEASTERLY  
FLOW IN THE VICINITY OF THE PRESCRIBED BURN SITE. SUNNY SKIES AND  
DRY CONDITIONS ARE EXPECTED THROUGHOUT THE DAY, AND AS AIR  
TEMPERATURES RISE INTO THE MID-UPPER 60S THIS AFTERNOON, RH VALUES  
WILL FALL TO BETWEEN 28-32% BETWEEN 1-7 PM CDT. TRANSPORT WINDS  
WILL REMAIN FROM THE EAST-NORTHEAST AT 10-15 MPH TODAY, PROVIDING  
SMOKE PLUME DISPERSION TO THE WEST-SOUTHWEST AS MIXING HEIGHTS  
HEIGHTS RISE TO BETWEEN 4350-4650 FT THIS AFTERNOON. DRY  
CONDITIONS AND LIGHT/VARIABLE TO LIGHT EASTERLY FLOW WILL CONTINUE  
TONIGHT, WITH ONLY A VERY LOW CHANCE FOR PATCHY FOG DEVELOPMENT  
AFTER MIDNIGHT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (0-5 PERCENT).  
MAX TEMPERATURE.....AROUND 69.  
MIN HUMIDITY........30 PERCENT.  
WIND (20 FT)........EAST WINDS 5 TO 6 MPH EARLY IN THE MORNING,  
BECOMING LIGHT.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......1100-2300 FT AGL, INCREASING TO 3100-4700 FT  
AGL LATE IN THE MORNING.  
TRANSPORT WINDS.....EAST 9 TO 16 MPH.  
LVORI...............2.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............44 50 55 60 63 66 68 69 69 69  
RH..............65 54 47 39 35 33 31 30 30 30  
20 FT WIND DIR..050 060 070 070 080 070 070 070 060 060  
20 FT WIND SPD..6 6 6 5 5 5 3 3 3 3  
20 FT WIND GUST. 7 6 6 6 6 5 5 4  
MIX HGT (KFT)...1.1 1.7 2.3 3.1 3.8 4.4 4.7 4.7 4.5 4.3  
TRANSP WIND DIR.050 070 090 090 090 090 090 080 070 070  
TRANSP WIND SPD.15 16 16 15 13 10 9 10 10 12  
DISPERSION IDX..7 7 7 57 58 54 50 57 55 58  
LVORI...........3 3 1 1 1 1 1 1 1 1  
CWR.............0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR (0-5 PERCENT).  
MIN TEMPERATURE.....AROUND 44.  
MAX HUMIDITY........79 PERCENT.  
WIND (20 FT)........LIGHT WINDS.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......2300-3900 FT AGL, DECREASING TO 0-1100 FT AGL  
IN THE LATE EVENING AND OVERNIGHT.  
TRANSPORT WINDS.....NORTHEAST 5 TO 13 MPH, BECOMING EAST 3 TO 5 MPH  
LATE IN THE EVENING.  
LVORI...............3.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............68 65 62 57 53 51 50 49 48 46 45 44  
RH..............31 35 41 51 61 66 68 71 71 76 76 79  
20 FT WIND DIR..060 060 070 060 060 070 070 080 080 080 080 080  
20 FT WIND SPD..3 2 3 2 2 2 2 2 2 2 2 2  
20 FT WIND GUST.4  
MIX HGT (KFT)...3.9 3.3 2.3 1.1 0.3 0.1 0.1 0.2 0.2 0.2 0.2 0.1  
TRANSP WIND DIR.060 060 060 060 060 060 080 090 090 080 080 080  
TRANSP WIND SPD.13 13 10 7 5 3 5 5 5 5 5 5  
DISPERSION IDX..59 51 30 10 2 1 2 2 2 2 2 2  
LVORI...........1 1 1 1 3 3 3 3 3 3 4 4  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
   
SATURDAY
 
 
SKY/WEATHER.........SUNNY (10-20 PERCENT).  
MAX TEMPERATURE.....AROUND 73.  
MIN HUMIDITY........31 PERCENT.  
WIND (20 FT)........LIGHT WINDS, BECOMING SOUTHEAST 5 TO 6 MPH IN  
THE LATE MORNING AND AFTERNOON, THEN BECOMING  
LIGHT LATE.  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
MIXING HEIGHT.......0-1200 FT AGL, INCREASING TO 4400-5800 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 5 TO 14 MPH, INCREASING TO 10 TO 16  
MPH IN THE LATE MORNING AND AFTERNOON.  
LVORI...............3.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........CLR MCR CLR CLR CLR MCR MCR PC PC PC MCR MCR  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............44 46 51 57 63 67 69 71 72 73 73 73  
RH..............79 73 63 53 43 37 35 32 33 31 33 34  
20 FT WIND DIR..080 090 110 120 120 120 130 130 130 130 130 130  
20 FT WIND SPD..2 2 3 5 6 6 6 6 5 5 5 3  
20 FT WIND GUST. 4 6 7 7 7 6 6 6 5  
MIX HGT (KFT)...0.1 0.2 1.2 2.4 3.6 4.4 4.9 5.3 5.6 5.8 5.7 5.3  
TRANSP WIND DIR.090 090 100 120 140 140 150 150 150 150 150 150  
TRANSP WIND SPD.5 6 9 14 16 16 15 13 12 10 10 10  
DISPERSION IDX..2 3 4 6 7 83 85 76 73 67 66 63  
LVORI...........4 3 3 3 1 1 1 1 1 1 1 1  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
 

 
FORECASTER...DIXON  
REQUESTED BY...CRAIG MOORE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1806862.1/HUN  
.EMAIL GCMOORE@FS.FED.US  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab AL Page
The Nexlab TN Page Main Text Page